#define _CRT_SECURE_NO_WARNINGS 1
#include<iostream>
#include<vector>

using namespace std;


void test1()
{

	vector<int> v = { 1,0,2,3,0,4,5,0 };
	auto it = v.begin();
	auto ip = v.insert(it + 3, 9);
	cout << *ip<<*(it+1);
}
int main()
{
	test1();
	return 0;
}